SaturnGoddex Posted June 21 Share Posted June 21 Hi! Lately I've been trying to get my head around GEOS programming, and I've been having a lot of fun. I ran into a bit of a roadblock - is there any way to get the coordinates of the last word printed to the screen? I've been making a character builder for a tabletop and I think it would be fun if you could click on words in bits of text to pull up the relevant rules. I was gonna make a loop to print word by word and just check if it's printing a keyword. Just curious if there's some easy trick I've been missing out on. I'm working in the Geocom basic compiler if that's relevant but if there's a method in assembly I'm sure I can figure out how to adapt it. Thanks! 1 Quote Link to comment Share on other sites More sharing options...
SaturnGoddex Posted June 21 Author Share Posted June 21 I may be a little spoiled by google. A little bit of reading between the lines in the hitchhikers guide to GEOS (probably should've just sat down and read that from the start XD) and it turns out you can snoop on the psuedo-registers r11 ($18, 2 bytes) and r1h ($05,1 byte). It scares even me to read registers directly like that but it certainly works. Probably wise to disable interrupts while you do this. May this knowledge serve whatever future wanderer finds this thread on a cold lonely night 3 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 22 Share Posted June 22 13 hours ago, SaturnGoddex said: hitchhikers guide to GEOS What version of GEOS does that describe? Quote Link to comment Share on other sites More sharing options...
SaturnGoddex Posted June 22 Author Share Posted June 22 20 hours ago, OLD CS1 said: What version of GEOS does that describe? Looking through it, it doesn't specifically say. It's from 1988 though so I'd imagine 2.0? Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 23 Share Posted June 23 1 hour ago, SaturnGoddex said: Looking through it, it doesn't specifically say. It's from 1988 though so I'd imagine 2.0? Would be right about the same release year. I have for a long time wanted to do something with GEOS, but like most things, just never have the time. I read one of the programmer's guides... pretty damn slick what they did in 64k of RAM. Quote Link to comment Share on other sites More sharing options...
SaturnGoddex Posted June 28 Author Share Posted June 28 It's been really fascinating getting up close and personal with it. Like once you consider the GEOS kernel it always keeps loaded and graphics memory your application is working with around 25k I believe? It's really just enough to load and execute code off a disk so you wind up playing this endless juggling game of loading and unloading modules but honestly it works. I can't argue with results, geos on the c64 certainly feels more usable to me than say a 128k macintosh. I suspect part of that is the 6502 having a lot better code density than a 68k, and I'm also pretty sure my opinion might be different if I was running it off an actual 1541 and swapping disks all the time Quote Link to comment Share on other sites More sharing options...
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